Not sure what happened

[bkushy]

So overnight a couple of my corals went from looking great to horrible. It's been about 3 days. Everything else.looks great in the tank. Did a water change and all parameters seem fine. Am going to test again tomorrow. Does anyone have any ideas.

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[bkushy]

The rest of the pics

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[mr_X]

Nothing looks bad to me. That said, what parameters have you checked?

 

[bkushy]

The top three pics are how they look now. The rest is how they were. I will test tonight and post everything.

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[bkushy]

Alk is 9.8
Cal 390
Mag is 1200
Red Sea test kit.
Didn't test anything else tonight.

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[mr_X]

What was the alk yesterday? How about when the corals started going down hill? Alkalinity swings can and usually do more damage than low, but stable alk.